These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Rating Newest Oldest. Best Answer: According to the Constitution, which was adopted by national referendum on 12 December 1993 following the 1993 Russian constitutional crisis, Russia is a federation and formally a semi-presidential republic, wherein the President is the head of state and the Prime Minister is the head of government.